Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Gas Chromatography (GC) (3) (-) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (1) Sample Type (-) Blood (1) Serum or Plasma (1) Urine (1) Test Area Therapeutics (1) Test Category Analgesics (7) Antianxiety (1) Anticholinergics (1) Antidepressants (1) Antidiabetics (2) Antidiarrheals (1) Antiemetics (1) Antiepileptics/Antiseizures (7) Antihistamines (4) Antihypertensives (4) Antimicrobials (7) Antineoplastics (1) Antipsychotics (4) Antitussives/Cough Suppressants (2) Cholinesterase Inhibitors (1) Depressants (1) Emetics (1) (-) Expectorants (1) Hallucinogens (4) Immunosuppressants (3) Muscle Relaxants (3) NMDA Antagonists (1) NPS/Designer Drugs (1) Sedative/Hypnotics (4) Stimulants (2) Test Sub-Category Other (1) Test Test Name 2185B Guaifenesin, Blood